*{
    margin: 0;
    padding: 0;
    text-decoration: none;
    color: black;
    list-style: none;
    outline: none;
}
body{
   
}
header{
    width: 1353px;
    height: 42px;
    background-color: #f7f7f7;
    margin: 0 auto;
    position: relative;
}
.header_mengceng{
    width: 1353px;
    height: 42px;
    position: absolute;
    transition: .5s;
}
nav{
    width: 1353px;
    height:78px;
    background-color: rgb(255, 255, 255);
    margin: 0 auto;
}

header li{
    list-style: none;
    float: left;
    padding-top: 10px;
}
header li:nth-of-type(1){
    padding-left: 840px;
}
header li a{
    text-decoration: none;
    font-size: 12px;
    font-weight: bold;
    color: #120c10;
    padding-left:12px;
}
header li:nth-of-type(3) .iconfont{
    padding-left: 5px;
}
header li:nth-of-type(4) .iconfont{
   font-size: 13px;
}
.logo{
    width: 140px;
    padding-top: 17px;
    padding-left: 15px;
    float: left;
}
.nav_box{
    width: 520px;
    height: 61px;
    background-color: rgb(255, 255, 255);
    float: left;
    display: flex;
    list-style: none;
    justify-content:space-around;
    align-items: center;
    margin-left:40px;
    margin-top: 13px;
}
.nav_box li{
    border-radius: 15px;
    width: 100px; 
    text-align: center;
    height: 25px;
    transition: .5s;
}
.nav_box a{
    text-decoration: none;
    font-size: 12px;
    color: #120c10;
    font-weight: bold;
}
nav input{
    width: 220px;
    height: 35px;
    border: 0;
    margin-left: 245px;
    margin-top: 30px;
    background:url(../images/搜索.gif) no-repeat 180px;
    border-radius: 20px;
    border: 1px solid grey;

}
.denglu{
    float: right;
    padding-top: 30px;
    padding-right: 10px;
    
}
.denglu a{
    font-weight: bold;
}
.denglu .iconfont{
    padding-right: 20px;
    font-size: 24px;

}



.erjihaha{
    width: 1353px;
    height: 0px;
    background-color: #120c10;
    position: relative;
    margin: 0 auto;
}
.zhineng_erji{
    position: absolute;
    left: 0;
    top: 0;
    width: 1353px;
    background-color: rgb(255, 255, 255);
    z-index: 1;
    transition: .6s;
    overflow: hidden;
    /* position: relative; */
   
}
.fuzhu{
    width: 100%;
    height: 20px;
    position: absolute;
    left: 0;
    bottom: -10px;
    z-index: 20;
}
.zhineng_erji div section:nth-of-type(1){
    width: 260px;
    height: 100%;
    background-color: rgb(255, 255, 255);
    float: left;
    
}
.zhineng_erji div section:nth-of-type(1) li{
    padding-top: 20px;
    padding-left: 20px;
    
    transition: .3s;

}
.zhineng_erji div section:nth-of-type(1) li b{
    float: right;
    display: none;
}
.on{
    display: block;
}
.zhineng_erji div section:nth-of-type(1) li:nth-of-type(1){
    padding-bottom: 10px;
    font-size: 30px;
    font-weight: bold;
}
.zhineng_erji div section:nth-of-type(2){
    width: 595px;
    height: 100%;
    background-color: rgb(255, 255, 255);
    float: left;
    border-right: 1px solid #000;
}

.zhineng_erji div section:nth-of-type(2) p{
    width: 200px;
    height: 300px;
}
.zhineng_erji div section:nth-of-type(3){
    width: 496px;
    height: 100%;
    float: left;
    position: relative;
    background-color: white;
}
.zhineng_erji div section:nth-of-type(3) img{
    padding-top: 90px;
    padding-left: 75px;
    width: 300px;
    position: absolute;
    transition: .3s;

}
.zhineng_erji div section:nth-of-type(3) li{
    padding-left: 90px;
    padding-top: 20px;
}
.zhineng_erji div section:nth-of-type(3) li:nth-of-type(1){
    padding-top: 480px;
}
.zhineng_erji div section:nth-of-type(3) li:nth-of-type(1){
    font-size: 26px;
    
}
.zhineng_erji div{
    width: 100%;
    height: 100%;
}
.off{
    display: none;
}
.guanBi{
    position: absolute;
    width: 50px;
    height: 50px;
    right: 15px;
    top: 15px;
    font-size: 33px;
    z-index: 1;
    border: 0;
    background-color:transparent ;
    transition: .3s;
}
.guanBi:hover{
   font-weight: bold;
   transform:rotate(180deg)
}
.erjiYouBian ul li{
    margin-top: 20px;
    background-color: rgb(255, 255, 255);
    margin-left: 20px;
}
.erjiYouBian ul li:nth-of-type(1){
    margin-top: 90px;
}